package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 登录拦截token,刷新token时间
 */
public class RefreshToeknInterceptor implements HandlerInterceptor {

    private final StringRedisTemplate stringRedisTemplate;

    public RefreshToeknInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (token == null) {
            return true;
        }
        //2.获取基于token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);

        //3.判断用户是否存在
        if (userMap.isEmpty()) {
        return true;
        }
        //将查询到的Hash数据转换为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token,800000000L, TimeUnit.HOURS);
        //为了隐藏敏感信息,转化为UserDTO存入
        UserHolder.saveUser(userDTO);

        //6.放行
        return true;
        }
}
